40mm 2:1 Heat Shrink Tubing – Electrical Insulation Sleeve for Cable & Wire

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40mm 2:1 Heat Shrink Tubing – Electrical Insulation Sleeve for Cable & Wire

HomeDIYer

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By HomeDIYer®

Color: Black

Length: 1 Meter

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$12.09 USD

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In stock (500 units), ready to be shipped

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40mm 2:1 Heat Shrink Tubing — Reliable Electrical Insulation for Every Wire and Cable Job

Whether you're rewiring a vehicle, repairing a marine electrical system, or tidying up a home workshop project, exposed splices and bare conductors are a safety hazard you can't ignore. Loose connections corrode, short out, and fail — often at the worst possible moment. This 40mm 2:1 heat shrink tubing gives DIYers, auto technicians, and electricians a fast, clean way to seal and protect wire connections without tape that unravels or connectors that don't fit.

Each order includes your chosen length of polyolefin heat shrink tubing in a 40mm (≈1.57") recovered inner diameter, available in lengths from 1 Meter (≈39.4") up to 10 Meters (≈393.7"). The 2:1 shrink ratio means the tubing recovers to approximately 20mm (≈0.79") when heat is applied, forming a tight, uniform sleeve. Choose from seven colors — Black, White, Red, Green, Yellow, Blue, and Transparent — to match your project or color-code your wiring.

Typical use cases include bundling and protecting automotive wiring harnesses, insulating battery cable terminals and ring connectors, covering wire splices in marine electrical panels, and organizing cable runs in workshop equipment or home electrical DIY projects — all scenarios where a durable, heat-shrinkable electrical sleeve makes the difference between a professional finish and a messy repair.

ℹ️ Compatibility: Fits cables and connectors with an outer diameter up to approximately 40mm (≈1.57"). After shrinking, recovered inner diameter is typically around 20mm (≈0.79"). Verify your cable OD before ordering — select variant options above for your preferred color and length.

✅ Key Features of These 40mm Heat Shrink Tubing Sleeves

🔥2:1 Shrink Ratio — Shrinks from 40mm (≈1.57") down to approximately 20mm (≈0.79"), creating a snug, uniform fit around cables, splices, and connectors without gaps or wrinkles.
🛡️Polyolefin Insulation Material — Offers solid dielectric insulation and moisture resistance for automotive, marine, and general electrical wiring applications where long-term protection matters.
🎨7 Color Options — Available in Black, White, Red, Green, Yellow, Blue, and Transparent, making it easy to color-code wire harnesses or keep labels visible under a clear heat shrinkable tube.
📏Flexible Length Selection — Choose from 1 Meter (≈39.4") to 10 Meters (≈393.7") to match your project scale, whether it's a single splice repair or a full wiring harness wrap.
✂️Easy to Cut and Apply — Cuts cleanly with standard scissors or a utility knife; shrinks evenly with a heat gun, making it practical for field repairs, workshop builds, and production runs alike.
🚗Versatile Application Range — Suited for automotive wiring harness protection, marine cable insulation, battery terminal covers, and general-purpose electrical sleeve work across DIY and professional settings.

📐 Technical Specifications — 40mm 2:1 Heat Shrink Tubing

Product Type	Heat Shrink Tubing / Electrical Insulation Sleeve
Expanded Inner Diameter	40mm (≈1.57")
Recovered Inner Diameter	Typically ~20mm (≈0.79") after full shrink
Shrink Ratio	2:1
Material	Polyolefin
Available Colors	Black, White, Red, Green, Yellow, Blue, Transparent
Available Lengths	1m (≈39.4"), 2m (≈78.7"), 3m (≈118.1"), 4m (≈157.5"), 5m (≈196.9"), 8m (≈314.9"), 10m (≈393.7")
Shrink Temperature	Typically 70–120°C (158–248°F) — contact us to confirm for critical applications
Wall Thickness (recovered)	See variant options
Voltage Rating	Contact us to confirm
Recommended Tool	Heat gun (lighter suitable for small sections)
Typical Applications	Automotive wiring, marine electrical, cable splicing, DIY electrical projects

❓ Frequently Asked Questions

How do I choose the right length of heat shrink tubing?

Measure the total length of the cable or splice you need to cover, then add at least 10–15% extra to account for shrinkage along the length axis. For example, to cover a 90cm (≈35.4") run, a 1 Meter length is generally sufficient. For longer wire harnesses or conduit runs, choose 3–5 Meter or 8–10 Meter options to minimize joins.

What does 2:1 shrink ratio mean?

A 2:1 shrink ratio means the tubing will shrink to approximately half its original inner diameter when heat is applied. This 40mm tubing will typically shrink down to around 20mm (≈0.79"), creating a snug, insulating fit around cables, connectors, or splices in that size range.

How strong is the insulation — can it handle high-voltage wiring?

This tubing is generally rated for low- to medium-voltage applications typical in automotive, marine, and household DIY wiring. For high-voltage industrial applications, please contact us to confirm the dielectric rating before ordering.

Is this heat shrink tubing suitable for outdoor or marine use?

The polyolefin material used in this tubing is generally moisture-resistant and performs well in outdoor environments. For fully submersed or salt-water marine applications, we recommend confirming suitability with our team, as adhesive-lined variants offer a stronger moisture seal.

What tool do I use to shrink the tubing?

A heat gun is the recommended tool for even, controlled shrinking. In a pinch, a lighter or match can work for small sections, but a heat gun provides more consistent results and reduces the risk of scorching. Typically, apply heat evenly from one end to the other, rotating the cable as you go.

What is the shrink temperature for this tubing?

Polyolefin heat shrink tubing in this category typically begins shrinking at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). Exact activation temperature may vary slightly by color — contact us to confirm if your application has strict thermal requirements.

Can I use this tubing on automotive wiring harnesses?

Yes. The 40mm diameter is well-suited for bundling and protecting multi-wire automotive harnesses, battery cable ends, and connector boots. The color options also make it easy to color-code circuits for easier future identification.

Does the color affect performance?

No — all color variants (Black, White, Red, Green, Yellow, Blue, Transparent) share the same shrink ratio, wall thickness, and insulation properties. Transparent tubing is popular when you want to keep labels or wire markings visible after installation.

🛒 Select your color and length above, then add to cart — ships from our US warehouse.

40mm 2:1 Heat Shrink Tubing – Electrical Insulation Sleeve for Cable & Wire

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Description

40mm 2:1 Heat Shrink Tubing — Reliable Electrical Insulation for Every Wire and Cable Job

✅ Key Features of These 40mm Heat Shrink Tubing Sleeves

📐 Technical Specifications — 40mm 2:1 Heat Shrink Tubing

❓ Frequently Asked Questions

40mm 2:1 Heat Shrink Tubing – Electrical Insulation Sleeve for Cable & Wire

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